﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "s0t2r3i4n5g6s7 8a9r1e2 0f0u5n";
            for (int i = 0; i < str.Length; i++)
            {
                char a = str[i];
                char b = '0';
                char c = '9';

                if (a >= (int)b && a <= (int)c)
                {
                    {
                        str = str.Remove(i, 1);
                    }
                }
            }
            Console.WriteLine(str);
        }
    }
}